InRoads2004-How to delete the Breakline Features from a surface?

I used Text Import Wizard to import some breakline Features to my surface, after I finished the import, I found I missed some settings with "Skip", I don't know how to modify it, so I re-import the ASCII file without remove the features from last import, I found now I have double numbers of Breakline Features in my surface, this is not right. Anybody can give me a hint how do you deal with this issue?

Thank you in advance.

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